/Engine/Source/Editor/UnrealEd/Public/WorkflowOrientedApp/WorkflowTabManager.h
Merges in a set of factories into this set - duplicates are OK.
void MergeInSet ( const [FWorkflowAllowedTabSet](API\Editor\UnrealEd\WorkflowOrientedApp\FWorkflowAllowedTabSet) & OtherSet )